Most people that one and done generally do it out of fear the opponent will adapt to them. It’s a cowardly tactic and I see it as a form of disrespect. I don’t tolerate disrespect from anyone so I block if done multiple times.
Go into ranked today and one and done every opponent.
Nobody is entitled to your time or a runback.
If they block you, it exposes their weak resolve as a competitor.
They only block because they are too slow to adapt and need infinite sets to carry weak fundamentals.